Thermal storage is to store the excess heat that is temporarily unnecessary for a period of time through some way, and then extract it when it is needed. Including three types of heat storage technology, submarine heat storage technology, and chemical response thermal energy storage technology. The comparison of three thermal energy storage Table 1.6.

The heat storage technology is to increase its temperature by heating the energy storage medium and store the thermal energy in it. Commonly used thermal energy storage materials include water, soil, and rocks. Under the same temperature changes, if the heat loss is not considered, the unit volume of the unit is the largest, the soil is the second, and the rock is the smallest. Many countries in the world have tested and applied these heat storage materials. At present, this is a method of energy storage with relatively mature technology, high efficiency, and low cost.

Submarine heat storage technology uses the melting heat generated by the phase changes between the energy storage medium liquid phase and the solid phase to store the thermal energy to store the thermal energy. The actual application of the latent thermal storage medium has sodium sodium sulfate (chemical formula is NA2S04 · 10H20), sodium sodium sulfate (chemical formula is NA2S04 · 5H20), and hexagonal calcium chloride (chemical formula is CACL2 · 6H20). The technology is characterized by energy storage at low temperature. It has high energy storage density and can take out heat at a certain phase change temperature. The storage device is also more complicated, and technical difficulty